Patent Application
20220314478
This application claims priority from European patent application EP21166273.9, filed on Mar. 31, 2021, its content being incorporated herein by reference.
The present disclosure relates to shaving razor cartridges and more particularly to shaving razor cartridges comprising blades facing in opposite directions.
Razor cartridges (also known as safety razor cartridges) are usually attached to a shaving razor assembly including a razor handle. In use, a user holds the razor handle and brings the razor cartridge into contact with a portion of skin. By movement of the razor cartridge in a shaving direction, unwanted hair is removed. Users with skin sensitivity issues, as well as issues related to pseudofolliculitis barbae or razor bumps, may have difficulties to shave safely and efficiently with conventional razor assemblies in some situations. Further, users with curly hairs, in particular users prone to pseudofolliculitis barbae, may want to shave hairs from two (different) directions. Shaving hairs from two directions may result in less hairs with sharp tips, which may prevent hair from re-entering the skin. However, shaving in two directions may involve potentially cumbersome rotation of the shaving razor assembly.
More recently, razor cartridge designs allowing shaving in both directions have been developed. These designs usually comprise one group of cutting members arranged to cut in the shaving direction and an adjacently placed second group of cutting members for shaving opposite the shaving direction. Use of these razor cartridges may lead to nicks and cuts, as each group of cutting members may only be supported by its cutting edges. Further, the existing designs may be bulky and thus may feel imprecise to the user.
The performance of razor cartridges may be further improved.
According to a first aspect, a razor cartridge is provided. The razor cartridge comprises a housing. The housing comprises a group of cutting members arranged between a trailing longitudinal side and a leading longitudinal side along a first shaving direction S.
The group of cutting members includes at least two forward facing blades. A forward facing blade is characterized by facing in the first shaving direction S of the razor cartridge.
Further, the group of cutting members includes at least one backward facing blade. A backward facing blade is characterized by facing opposite to the first shaving direction S of the razor cartridge.
The at least one backward facing blade, may be placed between the at least two forward facing blades, or, alternatively, the at least one backward facing blade, may be the cutting member closest to the leading longitudinal side.
In a second aspect, the present disclosure relates to a shaving razor assembly comprising a razor handle and a razor cartridge according to the first aspect, wherein the razor cartridge is either releasably attached to the razor handle via a pivotable or non-pivotable connection, integrally formed with the razor handle via a non-pivotable connection, or integrally formed with the razor handle via a pivotable connection.
In a third aspect, the present disclosure relates to a kit of parts comprising a razor handle and a razor cartridge holder comprising a plurality of razor cartridges to the first aspect.
Particular examples of the first to third general aspects can be implemented so as to realize one or more of the following advantages.
First, the at least one backward facing blade placed between the at least two forward facing blades may provide additional skin contact points. These skin contact points may reduce the skin bulge and, in turn, prevent nicks and cuts. In particular, skin bumps, for example from advanced pseudofolliculitis barbae may be guided away from the cutting edge of the next forward facing blades, in turn preventing cuts into the skin bump.
Further, backward facing blades can allow shaving against the first shaving direction S. This may allow cutting hairs from two directions, which may be especially beneficial for users with curly hair in some situations. Curly hair may tend to grow back towards the skin, where it may penetrate the skin, in particular if the hair has a sharp tip. Hair penetrating the skin may lead to skin irritations, in particular pseudofolliculitis barbae. Shaving hairs form two directions may lead to hairs with less sharp tips, compared to hairs only shaved from one direction and therefore the hairs may be less prone to growing back into the skin.
With conventional razor cartridges, it may be necessary to turn the shaving razor assembly at every skin portion that shall be shaved from both directions. The provision of forward and backward facing blades in one cartridge may provide a more efficient shaving procedure, as shaving in two opposite directions can be performed with a single back and forth motion.
The novel razor cartridge according to the first aspect, may further allow providing two forward facing blades with large inter-blade spans. A large inter-blade span may reduce the risk of cutting hairs very close or below the skin level. This may reduce the risk of trapped hairs, which could lead to skin irritation and in particular pseudofolliculitis barbae.
Certain Terms are Used in the Following Manner in the Present Disclosure:
Within the scope of this disclosure, the term “placed between” is not limited to an object being placed directly adjacent to two boundaries (e.g., of objects or elements) but may also encompass the object being placed between two boundaries (e.g., of objects or elements) but not directly adjacent to one or more of the boundaries, but instead directly adjacent to one or more other objects, which are also placed between the two boundaries. In particular within the scope of this disclosure, a first cutting member “placed between” two other cutting members is not bound to the meaning that no further cutting members can be arranged next to the first and one of the further cutting members (i.e., between the first and the one of the further cutting members. The same is true for other components than cutting members (e.g., a housing or guard component can be arranged next to the first cutting member being between two other cutting members).
The expression “first shaving direction” can but does not have to express any preference for the first shaving direction compared to a second (further) shaving direction the cartridges of the present disclosure might provide. The razor cartridges of the present disclosure can have a preferred direction (e.g., including a larger number of “active blades”) in some examples but can also be symmetrical (i.e., the cartridge looks the same when seen from the first and the second shaving direction).
The term “cutting-edge plane” is defined as the plane intersecting first and second skin contact areas of, for example, cutting edges of the shaving head. Movement of the razor handle by the user during shaving operation causes the blades of the razor cartridge to be moved across the cutting-edge plane in the shaving direction, enabling the blades to remove unwanted hair.
In use, in particular if the position of the cutting edges in relation to the razor cartridge is not fixed, the cutting edge plane may not be definable.
The term “shaving plane” SH is defined as the plane between the most prominent members of the housing of a razor cartridge. For example, the shaving plane SH may be defined as the plane between a guard member and a cap member that contact a user, in use. The shaving plane represents the theoretical position of the surface being shaved, which may be the skin. The shaving plane and cutting-edge plane may be congruent, if the cutting edge of the cutting members, lies in the same plane as the shaving plane, e.g. when the cutting edges are in the same plane, as the guard and cap member.
The term “inter-blade span” is herein defined as the span between two adjacent cutting edges,
The term “cutting-edge axis” is herein defined as the bisecting angle of the cutting-edge angle.
The cutting-edge angle is the angle formed by the tapered end of a blade or cutting member intended for cutting hair.
As mentioned before, a “shaving plane SH” is typically defined by the most prominent members of the housing of a razor cartridge. Based on that, an exposure E (of the cutting-edge plane with respect to the shaving plane) can be designated as negative, neutral, or positive. A neutral exposure defines that the cutting-edge plane is substantially coplanar with the shaving plane. A negative exposure implies that the cutting-edge plane is nearer to the base support member of the razor cartridge than the shaving plane or below the shaving plane. A positive exposure implies that the cutting-edge plane is further from the base support member compared to the shaving plane or above the shaving plane.
Other characteristics will be apparent from the accompanying drawings, which form a part of this disclosure. The drawings are intended to further explain the present disclosure and to enable a person skilled in the art to practice it. However, the drawings are intended as non-limiting examples. Common reference numerals on different Figures indicate like or similar features.
Hereinafter, a detailed description will be given of the present disclosure. The terms or words used in the description and the claims of the present disclosure are not to be construed limitedly as only having common-language or dictionary meanings and should, unless specifically defined otherwise in the following description, be interpreted as having their ordinary technical meaning as established in the relevant technical field. The detailed description will refer to specific embodiments to better illustrate the present disclosure, however, it should be understood that the presented disclosure is not limited to these specific embodiments.
The shaving razor assembly 1 comprises blades. The shaving razor assembly 1 comprises a handle 2 extending in a handle direction H between a proximal portion 4 and a distal portion 6 of the handle 2. A razor cartridge 20 is mounted at the distal portion 6 of the handle 2. The razor cartridge 20 will be presented in more detail following discussion of the shaving razor assembly 1.
The mounting of the razor cartridge 20 to the distal portion 6 of the handle 2 in the illustration is via a pivotable bearing member 8 enabling a frame of reference of the handle 2 to vary relative to a frame of reference of the razor cartridge 20, to thus enable the angle of the razor cartridge 20 against the skin of a user to vary and adapt to changes during use. In particular, the razor cartridge 20 pivots relative to the handle 2 about the longitudinal axis L of the razor cartridge 20, in use. The pivoting enables the user to adapt to contours of the body, for example. The longitudinal axis L of the razor cartridge 20 is substantially perpendicular to the shaving direction along the handle 2. Another example of a connection mechanism for connecting the razor cartridge 20 to the handle 2 is discussed in WO2006/027018 A1. Another alternative is a razor cartridge 20 that may pivot relative to a second pivot axis (a rocking axis), substantially perpendicular to axis L.
In some embodiments, the pivotable bearing member 8 may be omitted (not illustrated) and the handle 2 provided as an integrally connected part of the support of the razor cartridge 20. In some embodiments, the pivotable bearing member 8 may further comprise, or be replaced by, a release mechanism 5a, 5b, enabling rapid release of an exhausted razor cartridge 20 from the handle 2. In some embodiments, the handle 2 and the support of the razor cartridge 20 are integrally formed with a pivotable bearing member (not illustrated) such as a plastic spring member.
A pivotable bearing member (not shown) may, in some embodiments, be provided on the handle side of the razor cartridge 20 configured to connect to a pivotable handle 2. Such a pivotable bearing member, in some embodiments, comprises two or more shell bearings configured to connect to the pivotable bearing member 8 of the handle 2, although a skilled person is familiar with many attachment mechanisms of a razor cartridge 20 to a handle which are not excluded.
In some embodiments, the handle 2 is provided with a handle grip 9 formed of a rubber, or rubber-like material to improve gripping friction. In some embodiments, the handle is provided with a thumb-rest 7 to enable a more secure grip of the handle 2 by a user.
The shaving direction S is depicted in
As shown in
The razor cartridge 20 comprises a housing 21, wherein the housing comprises a group of cutting members 29 arranged between a trailing longitudinal side 25 and a leading longitudinal side 24 along a first shaving direction (S) (sometimes also referred to abbreviatedly as “shaving direction S” in the present disclosure).
The group of cutting members 29 includes at least two forward facing blades, forward facing blades being characterized by facing in the first shaving direction (S) of the razor cartridge 20. Also, the group of cutting members includes at least one backward facing blade, a backward facing blade being characterized by facing opposite to the shaving direction (S) of the razor cartridge 20.
The at least one backward facing blade, may be placed between the at least two forward facing blades, or the at least one backward facing blade, may be the cutting member closest to the leading longitudinal side 24.
Alternatively, the “skin contact point” may be considered to be a “skin contact area”. A “skin contact area” means a part of the arrangement of cutting members 28 that comes into contact with the skin of a user of the razor cartridge 20 in normal use. Of course, many parts of the housing 21 and/or guard member 23 will also contact the skin of a user during normal use of the razor cartridge 20, but the term “skin contact area” means the section of a cutting edge 33a-d of one of the blades of the razor cartridge 20. Therefore, when a plurality of cutting members 28a-28d is provided, there will be a plurality of skin contact areas in normal use. It is not essential that every skin contact area functions to cut a hair of the user. In particular, it is not essential that every skin contact area functions to cut a hair of the user in the shaving direction S. The skin contact areas provided by at least one backward facing blade, may provide support to the skin surface, which may reduce bulging 12. The reduction of bulging 12 may reduce skin irritations caused by shaving. Further, the backwards facing blade may guard an adjacent forward facing blade, by guiding the skin away from the blade edge. Further, the placement of at least one backward facing blade between two forward facing blades, may allow a wider inter-blade span between the two forward facing blades. The increased inter-blade span between two forward facing blades may prevent hairs from becoming trapped.
The same principle applies, when shaving opposite the shaving direction using the edge of the backward facing blades, wherein the forward facing blades provide further skin contact points or skin contact areas, which may support the skin to reduce bulging and guide the skin away from the cutting edges.
In some embodiments, the group of cutting members 29 may comprise exactly three cutting members, of which two cutting members are forward facing blades and one cutting member may be a backward facing blade.
Razor cartridges comprising three cutting members (e.g., exactly three, or more than three cutting members), wherein one cutting member is a backward facing blades, may allow shaving in both directions. Further, razor cartridges comprising three cutting members may provide the user with an improved feeling of precision, due to the possibly reduced dimensions of the razor cartridges, compared to state of the art razor cartridges comprising groups of cutting members facing in different direction, arranged adjacent to one another.
In some embodiments, the group of cutting members may comprise two forward facing blades and two backward facing blades.
Razor cartridges comprising four members (e.g., exactly four, or more than four cutting members), wherein two cutting members are forward facing blades and two cutting members are backward facing blades, may improve shaving wider areas of skin in both directions, as the shaving properties in both shaving directions may be similar, while in both shaving directions the skin is supported by the additional skin contact areas.
In some embodiments, the group of cutting members may comprise four cutting members, three of which may be forward facing blades and one may be a backward facing blade.
Razor cartridges comprising four cutting members, wherein three cutting members are forward facing blades and one cutting member is a backward facing blade, may improve trimming, as only a single blade facing against the shaving direction may provide the user with a feeling of precision, while providing several shaving contact areas to possibly reduce nicks and cuts.
In some embodiments, at least two backward facing blades may be placed between at least two forward facing blades.
Having introduced the concept of a group of cutting members 29 with a combination of cutting members mounted facing in the first shaving direction S or against the first shaving direction S (i.e., facing a second shaving direction), the mounting of the cutting members in a razor cartridge 20 will now be discussed.
Returning to
In some embodiments, the housing 21 may be fabricated partially or completely of synthetic materials, such as plastic, resin, or elastomers. In some embodiments, the housing 21 may be integrally formed. In some embodiments, the housing 21 may be formed from a plurality of sub-assemblies that are joined together by joining methods such as adhesive bonding, interference fitting, or ultrasonic or thermal welding, for example.
The housing 21 comprises a platform member (not shown) connectable to a handle 2 (for example, as shown in
In some embodiments, a guard member 23 is provided on the leading longitudinal edge of the razor cartridge 20. In use, the guard member 23 is the first portion of the razor cartridge 20 to contact uncut hairs. The side of the razor cartridge 20 opposite to the leading longitudinal side of the razor cartridge 20 and opposite to the shaving direction is the trailing longitudinal side 25 of the razor cartridge 20. The trailing longitudinal side 25 is thus the final portion of the razor cartridge 20 to contact the shaving plane SH, in use.
It will be noted that the terms “leading longitudinal side 24” and “trailing longitudinal side 25” are used to label specific locations on the razor cartridge 20, and do not imply or require the absence or presence of a particular feature. For example, a guard member 23 may in one example be located at the “leading longitudinal side 24” but it is not essential that this location comprises such a feature.
The guard member 23, in some embodiments, comprises an elastomeric member (not shown in
The razor cartridge 20, as illustrated in
In total, the eight resilient fingers each exert a bias force against respective cutting members of the group of cutting members 29 in the direction of the cutting-edge plane CEP such that the cutting members of the group of cutting members 29 are in a rest position, when the razor cartridge 20 is assembled. In the rest position, the cutting edges 30 of the blades 33, at each lateral end of the blades 33 near the first 26 and second 27 retainers, bear against corresponding stop portions, for example. In some embodiments, the stop portions may be the first 26 and second 27 retainer.
Accordingly, the rest position of the cutting members 28a-d is well defined, enabling a high shaving precision. Of course, the illustrated biasing arrangement has many variations. For example, a further plurality of resilient fingers may be provided on one or more of the cross members 35. In a simplified razor cartridge 20 design (such as for low cost, disposable razors), the resilient fingers may be omitted. A skilled person will appreciate that the number of resilient fingers 38 to be provided is related to the number of cutting members 28a-d in the group of cutting members 29, and that fewer or more than eight resilient fingers 38 can be provided. It is not essential that the resilient fingers are provided as the skilled person is aware of other mounting means for the cutting members 28. In examples, no biasing members are provided.
In some embodiments, a first debris run-off portion 46, a second debris run-off portion 47, and a third debris run-off portion 48 may be provided. The width of the debris run-off portions is defined by the relative spacing of the cutting members of the plurality of cutting members 29.
Each cutting member in the group of cutting members 29 comprises a longitudinal blade support 32 or a base portion 80. A longitudinal blade is mounted on the blade support 32 or alternatively, formed integrally with the base portion 80. The cutting edge 30 of a cutting member 28a-d may be oriented forward in the direction of shaving S or oriented backward against the direction of shaving S.
Each cutting member in the group of cutting members 29 is, in some embodiments, resiliently mounted in a blade receiving section 31 of the razor cartridge 20. The blade receiving section 31 comprises a longitudinal space in the razor cartridge 20 that is sized to accommodate the group of cutting members 29. At least one cutting member of the group of cutting members 29, up to all cutting members in the group of cutting members 29 may be resiliently mounted on the resilient fingers 38 in the blade housing 21. In the illustrated example of
Between the blade receiving section 31 and the handle (in a part adjacent to a handle 2 connection, for example) there are, in examples, provided one or more cross members 35 that are integrally formed with the housing 21. The cross members 35 may comprise a plurality of blade support guides 36 provided as a plurality of protuberances aligned with the holding slot 34 on the transverse inner sides of the housing 21. The blade support guides 36 function to provide an additional support to the blades in a direction parallel and perpendicular to the longitudinal direction, thus increasing the stability during use.
In the following, the relation between mounting of the blades and ensuing inter-blade spans shall be briefly described.
Of course, the provision of a succession of holding slots 34 in the first 26 and second 27 retainers to support the cutting members of the group of cutting members 29 is not essential. The group of cutting members 29 could also be supported using a plurality of blade support guides 36 (protuberances) positioned on one or more cross members 35. In some embodiments, a plurality of blade support guides 36 and a succession of holding slots 34 may be used in combination to provide adjusted inter-blade spaces in the longitudinal direction, to incorporate backward facing blades.
The span 49 between the tip of a trailing blade, wherein the trailing blade is comprised within a forward facing blade, and the edge of the leading longitudinal side facing towards said trailing blade, will be dependent on the number of cutting members 28 incorporated into the razor cartridge 20.
In some embodiments, the span between the tip of a forward facing blade and the tip of another forward facing blade, wherein exactly one backward facing blade is placed between the two forward facing blades, may be at least 1.5 mm, more specifically at least 2.0 mm and in particular at least 2.3 mm.
The inter-blade span between the tip of a forward facing blade and the tip of the next backward facing blade in shaving direction, may be between about 0.70 mm to about 1.1 mm, more specifically about 0.80 mm to about 1.0 mm and in particular about 0.85 mm to about 0.95 mm. The inter-blade span between the tip of a forward facing blade and the tip of the next backward facing blade in shaving direction, may be between about 0.45 mm to about 0.80 mm, more specifically about 0.55 mm to about 0.70 mm and in particular about 0.60 mm to about 0.65 mm. In some embodiments, the inter-blade span between the tip of a forward facing blade and the tip of the next backward facing blade in shaving direction, may be between about 0.20 mm to about 0.60 mm, more specifically about 0.30 mm to about 0.50 mm and in particular about 0.35 mm to about 0.45 mm.
Any of the aforementioned spans may be a leading inter-blade span 40, a first intermediate inter-blade span 41 or a trailing inter-blade span 42, as long as it is a span between the tip of forward facing blade and the tip of the next backward facing blade in shaving direction. The terms trailing inter-blade span or trailing blade refer to an inter-blade span or blade, which is closest to the trailing longitudinal side. Analogously, the terms leading inter-blade span or leading blade refer to an inter-blade span or blade, which is closest to the leading longitudinal side. The term intermediate inter-blade span refers to inter-blade spans, which are positioned between a leading and a trailing inter-blade span.
The span between the tip of the rearmost forward facing blade in shaving direction and the edge of the leading longitudinal side facing towards said forward facing blade, is between about 0.50 mm to about 0.90 mm, more specifically about 0.60 mm to about 0.80 mm and in particular about 0.65 mm to about 0.70 mm. In other words, in some embodiments, the leading blade to frame span 44 between the tip of the leading blade, wherein the leading blade is comprised within a forward facing blade, and the edge of the leading longitudinal side facing towards said forward facing blade, may be between about 0.50 mm to about 0.90 mm, more specifically about 0.60 mm to about 0.80 mm and in particular about 0.65 mm to about 0.70 mm.
The leading blade to frame span 45 between the tip of the trailing blade, wherein the trailing blade is comprised within a backward facing blade, and the edge of the trailing longitudinal side facing towards said backward facing blade, may be between about 0.50 mm to about 0.90 mm, more specifically about 0.60 mm to about 0.80 mm and in particular about 0.65 mm to about 0.70 mm.
The span between the tip of the foremost forward facing blade in shaving direction and the edge of the leading longitudinal side facing towards said forward facing blade, may be between about 4.0 mm to about 6.0 mm, more specifically about 4.5 mm to about 5.5 mm and in particular about 5.1 mm to about 5.3 mm.
In other words, the span 49 between the tip of a trailing blade, wherein the trailing blade is comprised within a forward facing blade, and the edge of the leading longitudinal side facing towards said trailing blade, may be between about 4.0 mm to about 6.0 mm, more specifically about 4.5 mm to about 5.5 mm and in particular about 5.1 mm to about 5.3 mm, in particular in a razor cartridge comprising three cutting members.
In the following, the design of the cutting members shall be discussed. The particular design of the cutting members 28 is not particularly limited.
The inward and outward blade support may have analogue structures, except for the blade mounting portions 70 and 71 being placed on opposing sides. In the following, the cutting members comprising a blade mounting portion, are described in more detail.
A blade support member (in other words a cutting member 28 without the blade 33 attached) comprises a substantially elongated flat lower portion 56, a substantially elongated flat top side 62, and a radius bend portion 58. The radius bend portion 58 may have an inner radius of curvature RO that is more than 0.1 mm. The radius bend portion 58 may have an inner radius of curvature RO that is less than 0.9 mm. A minimum recommended inner radius of curvature RO of sheet metal should be at least the same as its thickness T2. A safety factor of the thickness of the blade support 32 may be applied. By multiplying the safety factor with the thickness of T2 (around 0.17 mm), the radius of curvature RO may be approximately 0.25 mm, more specifically between 0.16 mm and 0.40 mm, and most specifically between 0.25 mm or 0.28 mm.
Alternatively, instead of a radius bend portion 58, the blade support member may have a groove (e.g., a V-shaped groove) along the length of the bend portion. The (V-shaped) groove may be applied by pre-scoring.
The blade support 32 may have a rounded or chamfered front end 72, to improve the glide properties of the cutting member. There may be a span 43 between the front end of the blade support and the cutting edge of the blade.
The blade support 32 may be made from a flat sheet metal part which is formed into a curvilinear section. In some embodiments, the blade support 32 is made from a metal such as austenitic stainless steel. After forming the curvilinear section, for cutting members wherein the blade is attached to an inward blade mounting portion, welding of the blade 33 on an inner surface 64 of the blade support 32 is performed. The cutting member 28 thus comprises a blade 33 (razor blade). Analogously, cutting members wherein the blade is attached to an outward blade mounting portion, welding of the blade 33 on an outer surface 66 of the blade support 32 is performed.
The blade 33 has, in its flat portion, a thickness T1 about 0.1 mm (for example, between 0.04 and 0.11 mm). The total length L2 of the blade 33 between the cutting edge 30 of the blade 33 and the opposite back edge of the blade 33 is about 1 mm (for example, between 0.8 mm and 1.3 mm). The portion of the blade 33 that is in contact with the inner surface 64 of a blade support that, in use, faces away from a shaving plane SH has a length L1 that is about 0.49 mm+/−0.1 mm long. In this way, a good retention of the blade on the underside of the blade support 32 (the inner surface of the blade support 32) is ensured.
In some embodiments at least one of the cutting members of the group of cutting members, may comprise an inward blade support having an inward blade mounting portion 70 disposed on an inner surface of the inward blade support that, in use, faces away from a shaving plane SH, and a first blade 33 attached to the inward blade mounting portion 70 and may be referred to as an inward blade in the following.
An inward blade may comprise an exposure between the upper edge of the inward blade support 30x and the cutting edge 33, as shown in
In some embodiments, at least one of the cutting members of the group of cutting members may comprise an outward blade support having an outward blade mounting portion 71 disposed on an outward surface of the outward blade support that, in use, faces towards a shaving plane, and an outward blade 33 attached to the outward blade mounting portion 71 and will be referred to as an outward blade in the following.
In some embodiments at least one of the cutting members of the group of cutting members, may further comprise a skin-guard element.
The skin-guard element may be in particular a comb-like structure. The comb-like structure may provide a further skin contact area. Further, the comb-like structure may raise the hair before cutting, hereby approaching a right angle between the cutting-edge axis of the cutting edge and the hair. This may allow cutting hair with a duller tip, as compared to cutting the hair without a comb-like structure.
The comb-like structure may be a separate element attached to a blade support, in particular a separate element which protrudes into the shaving plane (SH). In some embodiments, the comb-like structure may be an integrative element of an outward blade support. The comb-like structure may be an integrative element of an inward blade support.
In some embodiments, one or more of the cutting members, may be spring-loaded, in particular one or more cutting members may be spring loaded by one or more springs (not illustrated) placed in the holding slot. Alternatively, or additionally one or more springs may be placed on one or more blade support guides 36. The one or more spring-loaded cutting member may be configured to move in the direction perpendicular to the shaving plane. This may in particular allow the cutting members to retract into the razor cartridge, away from the shaving plane, thus gaining negative exposure.
In some embodiments, one or more spring-loaded cutting members may be forward facing blades.
In use, the perpendicular movement of the spring-loaded forward facing blades, may reduce the pressure between the blade edges and the skin. Reduced pressure between the blade edges and the skin may lead to less skin irritation caused by shaving.
In some embodiments at least one backward facing blade may not be spring-loaded.
In particular, when one or more spring-loaded forward facing blades is combined with one or more non-spring-loaded backward facing blades, the pressure between the skin and blade edges of the forward facing blades may be reduced, as the backward facing blades may support the skin.
When shaving in the direction opposite the first shaving direction S, utilizing the one or more backward facing blades, the backward facing blade(s) being fixed in the housing, may allow the backward facing blade(s) to shave hairs closer to the skin. Shaving hairs closer to the skin with a backward facing blade may be advantageous when cutting hairs which have already been cut a first time with a forward facing blade. Herein, the remaining hair stubble may be cut more precisely, as compared to a less close shave, which may allow dulling the edge of more hair stubbles. Shaving hairs closer to the skin with a backward facing blade, may also be advantageous in trimming as skin irritation may not be a prominent factor, as trimming may be applied to smaller skin areas.
In some embodiments, the cutting member 28 may be spring-loaded to have a maximum exposure E relative to the cutting-edge plane CEP in the range 0 um to −800 um, more specifically an exposure of about −750 um, −650 um, −600 um, −550 um, −500 um, −450 um, −400 um, −350 um, −300 um, −250 um, −200 um, −150 um, −100 um, −50 um, −25 um, −10 um, −5 um.
The type of spring is not particularly limited, but may comprise compression springs, torsion springs, flat springs, torsion bars and in particular cup springs. The material of the spring is not particularly limited, but may comprise metals, polymers, or elastomers. In particular, springs manufactured from elastomers, may comprise any geometry, as long as the spring can exert a restoring force on one or more cutting members.
The spring rate may vary between individual cutting members. Further, in some embodiments, one or more cutting members may have a positive exposure. In particular, one or more spring-loaded cutting members may have a positive exposure in the rest position, wherein the rest position, is the position of a cutting member, when the cutting member is not subjected to forces other than those stemming from the biasing arrangement.
Turning briefly to
In some embodiments, the angle A between the cutting-edge axis CEA of at least one blade and the cutting-edge plane, may be between about 10° to about 35°, more specifically about 15° to about 30° and in particular about 20° to about 25°.
In some embodiments, the angle A between the cutting-edge axis CEA of at least one blade and the cutting-edge plane, may be between about 5° to about 30°, more specifically about 10° to about 25° and in particular about 12° to about 17°.
In some embodiments, the angle A between the cutting-edge axis CEA of at least one blade, in particular the backward facing blade, and the cutting-edge plane, may be between about −10° to about 15°, more specifically about −5° to about 10° and in particular about 0° to about 5°.
In some embodiments, in particular a backward facing blade with a low cutting-edge axis CEA angle may be preferable, as users may try to remove shaving debris by wiping the razor cartridge 20 in the shaving direction with a finger. Herein, injury to the user's finger may be prevented by providing a backward facing blade with a low cutting-edge axis CEA angle, as it may not penetrate into the skin. Further, as shown in
In some embodiments, the razor cartridge may comprise three cutting members, wherein the backwards facing blade comprises a low cutting-edge axis, in particular a cutting-edge axis of 0°.
The altered cutting-edge axis CEA may be provided by two possible means. One possible means may be to reduce the inner radius of curvature. A second possible means may be to install the lower portion of the blade support 56 or the base portion 80 at an angle within the cartridge. Other elements, such as the blade support guide 36 or the resilient fingers 38, may need to be adjusted accordingly.
In some embodiments, the razor cartridge 20 may comprise an additional trimming member (not illustrated) on the trailing longitudinal side.
In some embodiments, the cutting-edge axis CEA of the trimming member may be substantially perpendicular to the shaving plane.
In some embodiments, the shaving razor assembly may further comprise a motor.
In some embodiments, the third 28c and fourth 28d cutting members seen from the leading longitudinal side may be forward facing blades and the first 28a and second cutting members 28b may be backward facing blades.
In some embodiments, the first 28a and second 28b cutting members seen from the leading longitudinal side may be forward facing blades and the third 28c and fourth 28d cutting members may be backward facing blades.
In some embodiments, the first 28a and fourth 28d cutting members seen from the leading longitudinal side may be forward facing blades and the second 28b and third 28c cutting members may be backward facing blades.
In some embodiments, the first 28a, and third 28c cutting members may be forward facing blades and the second 28b and fourth 28d cutting members may be backward facing blades.
In some embodiments the second 28b, and fourth 28d cutting members may be forward facing blades and the first 28a and third 28c cutting members may be backward facing blades.
In some embodiments, the first 28a, second 28b, and fourth 28d cutting members may be forward facing blades and the third cutting member seen from the leading longitudinal side may be a backward facing blade.
In some embodiments, the razor cartridge 20 may comprise five cutting members, wherein one cutting member is a backward facing blade.
In some embodiments, the razor cartridge 20 may comprise five cutting members, wherein two cutting members are backward facing blades.
In some embodiments, the razor cartridge 20 may comprise five cutting members, wherein three cutting members are backward facing blades.
In some embodiments, the razor cartridge may comprise three cutting members, the group of cutting members comprising at least one integral blade, one outward blade and one inward blade.
In some embodiments, the razor cartridge may comprise three cutting members, wherein at least one cutting member comprises a comb-like structure, in particular a backward facing blade may comprise a comb-like structure. In some embodiments, the razor cartridge may comprise four cutting members, wherein at least one cutting member comprises a comb-like structure, in particular two backward facing blades may comprise a comb-like structure. In some embodiments, the razor cartridge may comprise four cutting members, wherein at least one cutting member comprises a comb-like structure, in particular a forward facing blade may comprise a comb-like structure.
In some embodiments, a razor cartridge may comprise two forward facing blades and one backward facing blade may be provided, wherein the two forward facing blades are spring-loaded.
In some embodiments, a razor cartridge may comprise two forward facing blades and one backward facing blade may be provided, wherein the one forward facing blade is spring-loaded.
In some embodiments, a razor cartridge comprising three forward facing blades and one backward facing blade may be provided, wherein the three forward facing blades are spring-loaded.
In some embodiments, a razor cartridge may comprise four cutting members, wherein one cutting member is spring-loaded. In some embodiments, a razor cartridge may comprise four cutting members, wherein two cutting members are spring-loaded. In some embodiments, a razor cartridge may comprise four cutting members, wherein three cutting members are spring-loaded. In some embodiments, one or more of the backward facing members may be spring-loaded.
According to a second aspect, there may be provided a shaving razor assembly comprising a razor handle and a razor cartridge 20, wherein the razor cartridge 20 is either releasably attached to the razor handle 2 via a pivotable or non-pivotable connection, integrally formed with the razor handle 2 via a non-pivotable connection, or integrally formed with the razor handle 2 via a pivotable connection.
According to a third aspect, there may be provided a kit of parts comprising a razor handle and a razor cartridge holder comprising a plurality of razor cartridges 20.
The present disclosure also relates to the cutting members, razor cartridges, razors, kits, and methods of the following aspects:
In the preceding specification, numerous specific details are set forth in order to provide a thorough understanding. It will be apparent, however, to one having ordinary skill in the art that the specific detail need not be employed to practice the present disclosure. In other instances, well-known materials or methods have not been described in detail in order to avoid obscuring the present disclosure.
Reference throughout the preceding specification to “one embodiment”, “an embodiment”, “one example” or “an example”, “one aspect” or “an aspect” means that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in at least one embodiment of the present disclosure. Thus, appearances of the phrases “in one embodiment”, “in an embodiment”, “one example” or “an example”, “one aspect” or “an aspect” in various places throughout this specification are not necessarily all referring to the same embodiment or example.
Furthermore, the particular features, structures, or characteristics may be combined in any suitable combinations and/or sub-combinations in one or more embodiments or examples.
| Number | Date | Country | Kind |
|---|---|---|---|
| 21166273.9 | Mar 2021 | EP | regional |
